超高层建筑结构抗风性能研究
Research on Wind-resistant Performance for Super High-rise Building

针对按规范公式计算得到的超高层建筑结构风致振动不尽合理的问题，以西安环球贸易中心超高层建筑为工程背景，首先通过风洞试验测得各楼层的风荷载，再利用ANSYS参数化设计语言编制了能够精确求解超高层建筑风振系数及等效静风荷载的程序，进而对超高层建筑的抗风性能进行研究。结果表明：当风向角接近90°时，结构中部出现了极值位移风振系数，且其迎风面顺风向的变形和内力都达到了最大值，横风向的变形和内力则最小；当风向角为20°~70°时，位移风振系数随着楼层的增高而增加，其峰值出现在顶层；随着风向角的变化，结构扭转加速度峰值在各区间都是先减小后增大，特别是风向角呈45°左右时，结构扭转变形和基底扭矩达到了最大值；提出的将风洞试验与有限元分析相结合的新方法可为同类工程的抗风设计提供参考。
Aiming at the problem of the wind-induced response calculated by code was not accurate, the super high-rise building of Xi’an Global Trade Center was taken to be example. Firstly, wind load of every floor was got through wind tunnel test. Secondly, the ANSYS parametric design language was used to compile one calculation program to calculate the wind-induced vibration coefficients and equivalent aerostatic wind load. Then, the wind-resistant performance was studied. The results show that the extremum wind-induced vibration coefficients are founded in the middle of structure when wind attack angle is 90°. Meanwhile, the along-wind displacement and internal force of windward side also reach the maximum. On the contrary, the across-wind wind-induced response reaches minimum. When the wind attack angle is between 20° and 70°, the displacement wind-induced coefficients are increased with the increase of building and the maximum value occurs on the top floor. The peak torsional acceleration decreases firstly and then increases with the change of wind attack angle in every zone. Especially, when the wind attack angle is about 45°, the torsional deformation and base torsion reach maximum. Consequently, the new method, which combines the wind tunnel test with FEA, can provide some meaning reference for similar project